function put(){
			
			if(document.getElementById("fb.title").value=="")
			{
				
				titleMsg.innerHTML='���ⲻ��标题不能为空！';
			}else if(document.getElementById("fb.title").value.length>15){
				titleMsg.innerHTML='���ⲻ�ܳ���标题不能超过15个字符！';
			}else if(document.getElementById("fb.content").value==""){
				titleMsg.innerHTML='';
				contentMsg.innerHTML='���ݲ���内容不能为空！�գ�';
			}else if(document.getElementById("fb.content").value.length>100){
				contentMsg.innerHTML='���ݲ��ܳ���内容不能超过100个字符！';
			}else
			{
				contentMsg.innerHTML='';
				document.feedback.submit();
				alert("�提交成功!");
			}	
		}
				